在js中如何获取一个hash对象的键值对,尤其是键的获取

 var obj = { '1' : 'apple', '2' : 'orange', '3' : 'pear' };

 var arrMsg = ['apple', 'orange', 'pear'];

var array  = [{'111': 'apple'}, {'222': 'orange'}];

for(var key in obj){    
    console.log(key);      //输出为 1  2  3 
    console.log(obj[key]);//输出为 apple orange pear
}

for(var (key,value) in obj){    
    console.log(key);      //输出为 1 2 3
    console.log(value);//输出为 apple orange pear
}

for(var val in arrMsg){     
    console.log(val);      //输出为  apple orange pear
}

 for(var i=0;i<array.length;i++){
        var item=array[i];
        var key=Object.keys(item);
        console.log(item[key]); //输出为  apple orange